2026-04-21T04:31:03Zhttps://ebiltegia.mondragon.edu/oai/request

oai:ebiltegia.mondragon.edu:20.500.11984/18352024-03-01T12:17:34Zcom_20.500.11984_473col_20.500.11984_478

Optical Dual Laser Based Sensor Denoising for OnlineMetal Sheet Flatness Measurement Using Hermite Interpolation Alonso, Marcos Izaguirre Altuna, Alberto Andonegui Artegui, Imanol Graña Romay, Manuel cubic Hermite interpolation laser triangulation metal sheet flatness measurement roller leveling smooth surface reconstruction shape measurement system Flatness sensors are required for quality control of metal sheets obtained from steel coils by roller leveling and cutting systems. This article presents an innovative system for real-time robust surface estimation of flattened metal sheets composed of two line lasers and a conventional 2D camera. Laser plane triangulation is used for surface height retrieval along virtual surface fibers. The dual laser allows instantaneous robust and quick estimation of the fiber height derivatives. Hermite cubic interpolation along the fibers allows real-time surface estimation and high frequency noise removal. Noise sources are the vibrations induced in the sheet by its movements during the process and some mechanical events, such as cutting into separate pieces. The system is validated on synthetic surfaces that simulate the most critical noise sources and on real data obtained from the installation of the sensor in an actual steel mill. In the comparison with conventional filtering methods, we achieve at least a 41% of improvement in the accuracy of the surface reconstruction. 2020-09-23T06:58:49Z 2020-09-23T06:58:49Z 2020 http://purl.org/coar/resource_type/c_6501 1424-8220 https://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=159900 https://hdl.handle.net/20.500.11984/1835 eng Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ © 2020 by the authors. Licensee MDPI, Basel, Switzerland MDPI AG